I've never really had an issue with addiction. Well, sort of I guess. I use to smoke marijuana daily (MJ is addicting btw) and use to take a lot of LSD and ecstasy. Never had an issue with the last two really, but with MJ I just couldn't stop, regardless of if I wanted too or not. Honestly, just push yourself, track your progress and take into mind that your improving both your health and looks. After you make some progress, even if not much, just think of how disappointed you'd be having blown all that good time.
I really wish you the best of luck...